2. 外语
  3. The large populations and impressive cultural achievements of the Aztecs, the Mayas, and the Incas could not have come about wit

The large populations and impressive cultural achievements of the Aztecs, the Mayas, and the Incas could not have come about wit

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问题 The large populations and impressive cultural achievements of the Aztecs, the Mayas, and the Incas could not have come about without corn, which was not only nutritious but also was able to be dried, transported, and stored for long periods.
选项 A、which was not only nutritious but also was able to be
B、which not only was nutritious but also could be
C、which was not only nutritious but also it could be
D、not only nutritious but it could also be
E、not only nutritious but also able to be
答案B
解析 To answer this question, we need to understand the correct use of the construction not only...but
also .... We can easily eliminate the choices that use the construction inappropriately. Note that whatever immediately follows not only and but also must be grammatically parallel.
In this sentence, what immediately follows not only is an adjective (nutritious), but what immediately follows but also is a verb phrase (was able to be dried, ...). Therefore, this sentence does not use not only ... but also ... correctly, because what follows not only is not grammatically parallel with what follows but only.
Furthermore, could be dried is more idiomatically correct than was able to be dried, as is used here.
A    This choice is incorrect for the reasons discussed above.
B    Correct. This choice uses not only ... but also ... correctly. What immediately follows not only is a verb phrase (was nutritious), as is what immediately follows but also (could be dried,...). Therefore, this choice has an appropriate, grammatically parallel structure.
C    This choice does not use not only ... but also ... correctly, because what follows not only is not grammatically parallel with what follows but only. What immediately follows not only is an adjective (nutritious), whereas what immediately follows but also is an independent clause (it could be dried, ...).
D    This choice uses a slight variation on the not only ... but also construction. It is idiomatically acceptable to separate the but and also; for instance, rather than writing but also could be, you could correctly write but could also be. This variation, however should function in essentially the same way as not only ... but also does. Grammatically parallel structures must be associated with both not only and but... also ... But that is not the case in this choice: what is associated with not only is an adjective (nutritious), but what is associated with but... also ... is an independent clause (it could also be dried, ...). Therefore, this choice is not correct.
E    This choice does not use not only ... but also ... correctly, because what follows not only is not grammatically parallel with what follows but also. What immediately follows not only is an adjective, whereas what follows but also is a verb phrase. Furthermore, could be dried is more idiomatically correct than able to be dried, as is used here.
The correct answer is B.
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